package com.sky.Aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Slf4j
@Component
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper..*.*(..)) && @annotation(com.sky.anno.AutoFill)")
    public void autoFillPointCut(){}
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.debug("公共字段填充");
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType value = annotation.value();
        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args==null||args.length==0){
            return;
        }
        //准备赋值的数据
        Object entity = args[0];
        LocalDateTime now = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        try{
            Method setUpdateTime = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            if (value==OperationType.INSERT){
                Method setCreateTime = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,id);
            }
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,id);
        }catch (Exception e){
            log.error("公共填充失败",e);
        }
    }
}
